feat: PSJekyll.Template.IncludeGoogleFont ( Fixes #59 )

Types/PSJekyll.Template/IncludeGoogleFont.ps1

@@ -0,0 +1,24 @@
+<#
+.SYNOPSIS
+    Includes a Google Font.
+.DESCRIPTION
+    Includes a Google Font in the site.
+    
+    This will add a link to the Google Font.  It should be located in the head of the site.
+#>
+
+param(
+# The name of the font to include.
+[string]
+$FontName
+)
+if ($FontName) {
+    "<link href='https://fonts.googleapis.com/css?family=$fontName' rel='stylesheet'>"
+} else {
+    @(
+        "<% if site.googleFont %>"
+            "<link href='https://fonts.googleapis.com/css?family={{site.googleFont}}' rel='stylesheet'>"
+        "<% endif %>"
+    ) -join [Environment]::Newline
+}
+